gst_all_1.gst-plugins-good: enable jack plugin (#84543)

On Linux this adds two dependencies to the closure, libjack2 and celt, which
increases its size from 163.5 MB to 164.4 MB.

This should not cause any issues on macOS since jack supports it.

pkgs/development/libraries/gstreamer/good/default.nix

@@ -29,9 +29,7 @@
 , mpg123
 , twolame
 , gtkSupport ? false, gtk3 ? null
-  # As of writing, jack2 incurs a Qt dependency (big!) via `ffado`.
-  # In the future we should probably split `ffado`.
-, enableJack ? false, jack2
+, enableJack ? true, libjack2
 , libXdamage
 , libXext
 , libXfixes
@@ -104,8 +102,8 @@ stdenv.mkDerivation rec {
     libavc1394
     libiec61883
     libgudev
-  ] ++ optionals (stdenv.isLinux && enableJack) [
-    jack2
+  ] ++ optionals enableJack [
+    libjack2
   ];
 
   mesonFlags = [
@@ -113,8 +111,8 @@ stdenv.mkDerivation rec {
     "-Dqt5=disabled" # not clear as of writing how to correctly pass in the required qt5 deps
   ] ++ optionals (!gtkSupport) [
     "-Dgtk3=disabled"
-  ] ++ optionals (!stdenv.isLinux || !enableJack) [
-    "-Djack=disabled" # unclear whether Jack works on Darwin
+  ] ++ optionals (!enableJack) [
+    "-Djack=disabled"
   ] ++ optionals (!stdenv.isLinux) [
     "-Ddv1394=disabled" # Linux only
     "-Doss4=disabled" # Linux only